Mining



Aug. 5, 1930.

Y F. W. FARRELL COATED PAPER original Filed July 1'1. 192s ADHESIVE @W7/IVG PA PER Eu/enfer# named Aug. s, 1930 VUNITED s-ra'rrs PATENT ori-uca Bassum IBEDEBICIK W. FARBELL, OF BBOOKFIELD, MASSACHUSETTS, ASSIGNOB., BY MFSNE ASSIGNMENTS, T MINNESOTA MINING & MANUFACTURING COMPANY, OF ST.

I PAUL, MINNESOTA, A CORPORATION 01% MINNESOTA COATED PAPER Y Original No. 1,888,453, dated September 4, 1928, SeriaLNo. 44,358, yiled .Tuly 1'?, 1925. .Application for reissue :tiled January 2B, 1929. Serial No. 335,677.

This invention relates to coated papers, and more especially to gummed papers, clothv and other sheet materials, hereinafter referred to as paper'n v 5' It is now a common practice to apply paint,

varnish, and the like, to furniture, automo-v.

biles, and other articles, by means of a spray gun. In spraying the paint on some kinds of werk, it is nepessary to protect some parts of the work from the spray. This is particularly true in painting automobiles since different parts of an'automobile are often painted in diierent colors and some parts, such as the windshield, windows and upholsteryr must always be protected from the paint or varnish. At present, the usual practice is to cover the parts to beprotected with newspapers, or other cheap paper, and to hold the paper in place by means of surgeons tape or or inary gummed sealing tape. The surgeons tape is expensive and the sealing tape can be removed after the work is finished only with considerable' difficulty.

It is essential that the adhesive'tape'used shall have suhcient -strength and adhesion to hold the covering paper from -being blown oil' the work by the force of the blast of air which creates the spray. At the same time it is desirable that the paper be stripped off easily when the work is finished, and that any of the adhesive which isleft on the work be of such a character that it can be easily removed.

The present invention aims to devise an adhesively coated paper which will be relatively inexpensive to manufacture and will be pecially adapted for use under the conditions above described. A

I have found that the foregoing requirements are satisfied by a paper coated with a water soluble adhesive carrying a suicient quantity of glycerine orrsome other hygro# scopic agent to keep the adhesive tacky under .normal atmospherlc conditions. The adhesive used may consist of Irish m05, gelatine glue, gum tragacanth, or the like. Because o f its low price, I prefer to use Irish'moss, but since the adhesive properties of this material vary considerably, I add to it a certain v 5 percentage of gelatine glue or some equivalent material which is of amore uniform character. A formula which has proved satisfactory consists of 10 parts, by weight, of Irish moss,8 parts ofgelatine glue, 125 parts of water, and parts of glycerine.A This formula, may, however, be varied considerably, and I have found that good results are produced by using from 8 to l5 parts of Irish moss, with gelatine glue varying vfrom zero to 10 parts, glycerine from 45 to 7 5 parts and Water from 125 to 275 parts. Also, other water soluble adhesives may be used in place of those mentioned. n,

An adhesive material made by formulae suoli as those above given can be applied to the paper with the usual coating machinery. A large part of the water, subsequently is driven off by drying so that the quantity of water remaining in the coatedpaper when it is ready for the market is approximately 7equal to the lglycerine. In this condition the y coating is tacky under normal atmospheric conditions and will remain tacky practicallyA indefinitely.

I prefer to use a relatively strong paper, such as a kraft paper, and to coat one side of the paper with starch, casein, or some other filling material which will protect the paper from abrasion. The adhesive coating is applied to the opposite sideof the pape-r.

Figs. 1 and 2 of the accompanying drawings are perspective and crossesectional views, respectively, illustrating a coated paper embodying this invention. The paper sheetis shown at 2, the adhesive coating at 3, andthe filling material at 4. It will be understood that the thickness of the paper and coatings necessarily is exaggerated in Fig. 2.

In order to prevent the paper when wound in rolls or stacked in sheets from sticking together and caking, I prefer to insert a strip or sheet of glas'sine or other moisture resisting paper between adjacent sheets of the gummed paper.

This gummed manner either directly to cover the surface to be protected from the paint or varnish spray, or lin vstrips to secure another protect1ve paper to the work. The adhesive coating Ais usually moistened before the paper 1s paper is used inthe usualv .is finished the paper ycan easily be stripped off due tothe fact that the adhesive coating has remained tacky or sticky. The paper can then be used again either with or Without' additional moistening. Usually it is Vnot necessary to moisten it for subsequent applications, but this may be necessary occasionally due to the fact that the solvent used in the paint sometimes dries out a certain Aamount" of the Water in the adhesive coating.

The fact that the back of the paper, that is, the surface which is not covered with adhesive, is coated with a filler which protects the paper against roughing up when it ils rubbed in being applied to the work, greatly increases the life of the paper.

l While I have herein disclosed the best embodiment of my invention that I have so far devised, it will be appreciated that the invention is susceptible of embodiment in many forms Without departing from the spirit or scope thereof.

Having. thus described `my invention, what I desire to claim als new is:

l. An article of the character described comprising paper having one side thereof coated with a filler and its opposite side coated with a water soluble adhesive which is tacky under normal atmospheric conditions.

2. An article of the character described comprising paper having one side thereof coated with an adhesive compound comprising a small percentage of a water soluble adhesive, a larger percentage of glycerine, and a proportion of water approximately equa to that of glycerine.

`3. An article of the characterdescribed comprising a relatively strong sheet of paper having on one side thereof a coating to protect it against abrasion, and on its opposite side a coating of a relatively weak water soluble adhesive including a substantial percentage of glycerine.

`.LAn article of the character described cdmprising paper having one side thereof coated with a gelatinous adhesive compound comprising a small percentage of a water soluble adhesive and a larger percentage of glycerine to retain the gelatinous material tacky or sticky whereby the paper-may be normally adhesively' aixed in position by pressure and may e reused upon removal, and retain substantial tacky or sticky characteristics. i

5.. In a pressure sensitive adhesive paper,

an adhesive coating which -is normally tacky or sticky, comprising 8 to 25 parts of total adhesive material and 45 to 7 5 parts of glycretaining terials combined' with water amounting to 8 to 25 parts of total adhesive material and 45 to parts of glycerine and characterized by y l bein normallytacky or sticky.

7 n a pressure sensitive adhesive paper, a normally tacky, sticky adhesive coating obtained by depositing a composition comprising water soluble adhesive materials, including Irish moss and gelatine glue from 8 to 25 parts, glycerine from 45 to 7 5 parts, water from 125 to 275 parts, the deposition product including substantially equal parts of Water and glycerine.

Y 8. In a pressure sensitive adhesive paper, a normally tacky, sticky adhesive coating including in the partially dried form water soluble adhesive materials 8 to 25 parts, hygroscopic material 45 to 7 5 parts, the water be- Y `ing retainediii quantity to normally retain the adhesive material tacky, sticky or pressure sensitive.

9. An article of the character described comprising paper having on one side thereof '11. A normally removable and reusable adhesive tape comprising a paper backing having one side thereof substantially uniformly coated with an adhesive including in's'itu a predetermined moisture content and a'qu'antity of a moisture retaining substance' for maintaining said adhesive normally tacky and pressure sensitive, the predetermined moisture content coacting with said moisture substance rendering said adhesive coating 1n the tacky and pressure sensitive condition aforesaid. Y

In witness whereof I have hereunto'signed my name this 16th day of January, 1929.

FREDERICK W. FARRELL.

crine, and water, to maintain the 'adhesive material and'glycerine components tacky or sticky.

6p. In a pressure sensitive adhesive paper, an adhesive coating comprslng adhesive mallO 

